JPH0454289A - Compressor provided with to transmission for automobile air conditioning - Google Patents

Abstract

PURPOSE:To improve lubricity of a transmission unit at the time of an operation stop, by controlling temporarily an existing compressor portion into a lubricant easy recovery rotation number in preference to control which stops the compressor portion by an OFF operation, during an operation in which the ratio of shift is charged in response to an air conditioning load. CONSTITUTION:A freezing cycle circuit 7 is constituted by connecting in order by means of a refrigerant pipe 6 a compressor 1 provided with a transmission, a condenser 2, a receiver tank 3, an expansion valve (a depressurizing device) 4, and an evaporator 5, and a compressor main body 1a which connects in series a compressor unit 40 through a transmission 20, is used as the compressor 1 provided with a transmission. Also, a drive motor 77 at the transmission 20 is controlled by means of a control unit 90 on the basis of an ON/OFF signal from an operation unit 91 and detection signal from various sensors 92-94. In this instance, the rotation number of the compressor unit 40 is temporarily controlled to a number of revolution which is suitable for the recovery of lubrication oil, before the operation stop of the compressor unit 40 at the time of OFF operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to auxiliary equipment for automobiles, particularly to a compressor with a transmission for automobile air conditioning, which is provided with a transmission section on the input side.

(Prior art) Compressors used for automobile air conditioning are generally driven by the driving engine installed in the automobile as a power source, so the input side of the compressor varies greatly depending on the driving conditions of the automobile, etc. do.

However, the compressor itself only needs to have a certain rotation speed required to obtain the capacity according to the air conditioning (cooling) load, so it is necessary to adjust the fluctuating rotation speed of the input end to the rotation speed corresponding to the capacity. There is.

Therefore, a compressor with a transmission has been proposed as shown in Japanese Unexamined Patent Publication No. 170787/1987.

This has a structure in which a compressor section is connected in series to the input shaft section via a continuously variable transmission section, and changes in the engine speed are absorbed by the speed change of the transmission section to meet the required requirements. The rotation speed is transmitted to the compressor section.

(Problems to be Solved by the Invention) According to this compressor with a variable transmission, capacity control according to the cooling load can be effectively performed. That is, by steplessly controlling the gear ratio of the transmission part from "0 to maximum" according to the cooling load, the necessary cooling capacity can be secured without being affected by fluctuations on the engine side.

However, when such a compressor with a variable transmission stops cooling operation (speed ratio is 0), the following problems may occur.

In other words, in a compressor with a transmission incorporated in a refrigeration cycle circuit, the conventional method of lubrication is as follows: First, an appropriate amount of refrigeration oil (lubricating oil) is sealed in the refrigeration cycle circuit, and this refrigeration oil is compressed. By circulating the refrigerant mixed with the refrigerant in accordance with the compression operation of the machine section, the transmission section and the compressor section are lubricated during cooling operation. Second, the compressor with a variable transmission is provided with an oil sump where a portion of the refrigerating machine oil accumulates, and when the cooling operation is stopped when the refrigerant circulation stops, the refrigeration oil accumulated in the oil sump is splashed. The sliding parts of a moving transmission part are lubricated by the following methods.

For this reason, when a compressor with a variable transmission is operated in a low speed/speed ratio region, the amount of refrigerant discharged decreases, and the amount of refrigerating machine oil that returns to the compressor decreases extremely or does not return at all.

This means that depending on the operating conditions before the cooling operation is stopped, the amount of refrigerating machine oil that accumulates may be extremely small or almost non-existent. If the refrigeration operation stops under these conditions, the shift S
! The lubricity of the sliding parts of the compressor deteriorates, causing wear and abnormal heat generation of the sliding parts, reducing the reliability of the compressor. Especially when there is almost no amount of refrigeration oil remaining,
Since the transmission section operates virtually without lubrication when the cooling operation is stopped, reliability is significantly reduced.

This invention was made with attention to these circumstances,
The purpose is to provide a compressor with a transmission for automobile air conditioning that can improve the lubricity of the transmission part when the operation is stopped.

(Means for Solving the Problems) In order to achieve the above object, a compressor with a transmission according to claim 1 is provided, in which a compressor section is connected to an input shaft section via a transmission section, and the transmission section is connected to an input shaft section via a transmission section. and a compressor body configured to have an oil reservoir section for storing a common lubricating oil for lubricating the compressor section, and the lubricating oil is mixed with refrigerant gas and discharged to the outside, and a speed changer section of the transmission section. an air conditioning control means for controlling the air conditioning ratio according to the air conditioning load; an on/off means for turning on and off the air conditioning control means; a means for stopping the operation of the compressor section in response to an off operation of the on/off means; and the on/off means. and an oil recovery control means for temporarily controlling the rotation speed of the compressor section to a rotation speed suitable for recovering lubricating oil before the operation of the compressor section is stopped when the compressor section is turned off.

The compressor with a transmission according to claim 2 also includes an oil reservoir that connects the compressor section to the input shaft section via the transmission section and stores a common lubricating oil for lubricating the transmission section and the compressor section. a compressor body configured to include a compressor main body, in which the lubricating oil is mixed with refrigerant gas and discharged to the outside; a compressor rotational speed detection means for detecting the rotational speed of the compressor portion; and a transmission portion. an air conditioning control means for controlling the gear ratio of the air conditioner according to the air conditioning load;
on/off means for turning on and off the air conditioning control means;
means for stopping the operation of the compressor section in response to an off operation of the on/off means; and a rotation speed range with a low return oil amount detected by the compressor rotation speed detection means when the on/off means is turned off. In this case, an oil recovery control means is provided for temporarily controlling the rotation speed of the compressor section to a rotation speed suitable for recovering lubricating oil before the operation of the compressor section is stopped.

Similarly, a compressor with a transmission according to claim 3 is provided with a compressor unit that connects a compressor unit to an input shaft unit via a transmission unit, and stores a shared lubricating oil that lubricates the transmission unit and the compressor unit. a compressor main body configured to have a reservoir portion and in which the lubricating oil is mixed with refrigerant gas and discharged to the outside; an air conditioning control means that controls a gear ratio of the transmission portion in accordance with an air conditioning load; an on-off means for turning on and off the air conditioning control means; a means for stopping the operation of the compressor section in response to the off operation of the on-off means; When an oil-free detection signal is detected from the oil detection means when the on/off means is turned off, the compressor section is temporarily lubricated with oil before the compressor section stops operating. The present invention includes an oil recovery control means for controlling the rotation speed to a speed suitable for oil recovery.

(Function) According to the compressor with a variable speed transmission according to claim 1, when the on/off means is turned off during operation while changing the speed ratio according to the air conditioning load, the compressor section is stopped by the off operation. Regardless of the engine speed, the oil recovery control means temporarily sets the current compressor to a speed at which lubricating oil can be easily recovered. Then, the lubricating oil flows into the air conditioning circuit (
refrigeration cycle) and returns to the oil sump in the compressor body.

Thereby, necessary lubricating oil can always be ensured in the oil reservoir before the operation is stopped.

Therefore, even when the operation is stopped, the lubrication of the transmission section is not impaired.

According to the compressor with a transmission according to the second aspect, in order to effectively recover the lubricating oil without waste, the lubricating oil in the oil reservoir is reduced during the off operation described in the first aspect. Only when the rotation speed of the compressor section is in the rotation speed range of the compressor section, priority is given to stop control of the compressor section, and the current rotation speed of the compressor section is temporarily set to a speed at which lubricating oil can be easily recovered.

According to the compressor with variable speed according to the third aspect, in order to effectively recover the lubricating oil without wasting it, the state in which the lubricating oil in the oil reservoir is reduced during the off operation described in the first aspect is controlled. Only when the detection signal indicating (no oil) is output from the oil detection means,
Priority is given to stop control of the compressor section, and the current speed of the compressor section is temporarily set to a speed at which lubricating oil can be easily recovered.

(Embodiment) The present invention will be described below based on a first embodiment shown in FIGS. 1 to 6. Figure 2 shows the schematic configuration of an automotive air conditioner, where 1 is a compressor with a transmission, 2 is a condenser, and 3 is a compressor with a transmission.
is a receiver tank, 4 is an expansion valve (decompression bag W), and 5 is an evaporator. The respective refrigeration cycle devices are connected in sequence through refrigerant pipes 6 to form a refrigeration cycle circuit 7. A driven pulley 8 provided at the input part of the compressor 1 with a transmission and a drive pulley 10 provided at the crankshaft of a driving engine 9 mounted on the automobile are connected to a belt, for example, an endless V-shaped belt. They are connected by a belt 11.

In other words, the compressor 1 with a transmission is driven using the driving engine 9 as a power source. Note that 5a is a blower fan for blowing cold air obtained by heat exchange in the evaporator 5 into the cabin of the automobile (not shown).

The compressor 1 with a transmission includes a compressor main body 1a in which a wave plate type compressor part 40 is connected in series via a transmission part, for example, a frictionless continuously variable transmission 20. The detailed structure of the compressor main body 1a is shown in FIGS. 3 and 4.

To explain the compressor section 40, 41 is a cylinder block. This cylinder block 41 is composed of a front cylinder block 41a and a rear cylinder block 41b that are divided in the front-rear direction. Each cylinder block 41a.

On the circumferential side of 41b, a plurality of cylinders 42 are provided in parallel along the circumferential direction, and each cylinder 42 is formed with a hole that penetrates both the cylinders along the front-rear direction. And each of these cylinders 4
A piston 43 is slidably inserted into each of the pistons 2.

A front valve plate 44 and a front side housing 45 are sequentially provided at the end of the front cylinder block 41a.

Further, a rear valve plate 46 and a rear side housing 47 are sequentially provided at the end of the rear cylinder block 41b. The front side housing 45.
Valve plate 44° cylinder block 41. It is fastened to the rear side housing 45 with a through bolt 48 passing through the valve plate 46, and constitutes a main body portion. Note that, although not shown, in the valve plate portion facing each cylinder 42, a discharge hole and a discharge valve are provided at the outside of the cylinder block, and a suction hole and a suction valve are provided at the center of the cylinder block. There is. However, 49
indicates the valve holder of the above discharge valve.

Further, a drive shaft 50 is arranged in the center of the cylinder block 41 along the front-rear direction. And this drive shaft 50
The front end of the front side housing 45 protrudes forward from the front side housing 45. Note that A indicates the axis of the drive shaft 50. This drive shaft 50 has front and rear cylinder blocks 41a and 41b, respectively.
It is rotatably supported by radial bearings 51b, 51b provided in the. A wave plate 51 connected to each piston 42 is fitted into the center of the drive shaft 50, and the wave plate 51 allows each piston 43 to reciprocate within the cylinder 42.

That is, the cylinder 4 is located at the front end of the rear cylinder block 41b where the wave plate 51 is arranged.
A circular recess 52 that extends to 2 is formed. The wave plate 51 is housed in the recess 52, and the wave plate 51 has, for example, an outer diameter that matches the diameter of the cylinder 42. Also this wave plate 5
The outer circumferential portion of each piston 43 corresponding to the outer circumferential end of
A recess 53 is formed to accommodate the end.

A pair of rollers 54 and 55 are rotatably mounted in each of these recesses 53 so as to sandwich the plate surface portion of the wave plate 51 that enters the recess 53 from both sides, and the rollers 54 and 55 rotate. wave plate 51
By transferring on the plate surface part of the wave plate 5
The piston 43 reciprocates within the cylinder 42 by a tilt displacement of 1. In addition, the wave plate 51
The thrust direction is the hub 51a of the wave plate 51.
It is rotatably supported by a thrust bearing 57 provided between the cylinder block wall and the opposite cylinder block wall.

Inside the rear side housing 47, there is an annular suction chamber 5 in the center that communicates with each suction hole of the valve plate 46.
8 (low pressure chamber), and an annular discharge chamber 59 (high pressure chamber) that communicates with each discharge hole of the valve plate 46 is provided on the outside.

Further, on the center side of the front side housing 45, there is a circular notch 60 that communicates with each suction hole of the valve plate 44.
(low pressure chamber) is formed, and an annular discharge chamber 6 that communicates with each discharge hole of the valve plate 44 is formed in the outer internal part.
1 (hyperbaric chamber) is provided. The notch 60 communicates with the suction chamber 58 through a passage (not shown), and also communicates with a suction nozzle 62 provided on the front side of the compressor with a transmission 1 through the inside of the transmission 20, which will be described later. . In addition, each discharge chamber 59.61 is connected to the rear cylinder block 41.
It communicates with a nozzle mounting opening body 63 formed on the side portion of b (on the rear side of the compressor 1 with a transmission) via a passage (not shown). As a result, when each piston 43 reciprocates in accordance with the rotation of the drive shaft 50, the refrigerant sucked from the suction nozzle 62 is compressed, and the compressed refrigerant is then transferred to the discharge chamber 59.
．． 61 and a nozzle mounting port body 63, and is discharged from a discharge nozzle 64 attached to the nozzle mounting port body 63 to the condenser 2. In addition, wave plate 5
In order to lubricate the sliding parts around 1, suction refrigerant is introduced into the recess 52 using a passage (not shown).

On the other hand, regarding the transmission 20, reference numeral 21 denotes a housing that is hermetically connected to the periphery of the front side housing 45 by bolts (not shown). The housing 21 has a substantially cap shape, and an oil reservoir 37 is formed at the inner bottom. A certain amount of refrigerating machine oil 38 (lubricating oil) is stored in this oil reservoir 37.

Further, the above-mentioned suction nozzle 62 is provided on the upper side of the housing 21.
An eye body portion 21g is provided with a .

A radial bearing 22 provided on the front wall of the housing 21 supports an input shaft 2 that serves as an input section.
3 is rotatably supported. The input shaft 23 is coaxial with the axis A of the drive shaft 5o, and the housing 21
It passes through the front side of the. And this input shaft 23
The driven pulley 8 is attached to the penetrating end of the input shaft 23 so that the rotation of the engine 9 can be input to the input shaft 23. In addition, 24 is a radial bearing for supporting the pulley, 25
shows an oil seal provided on the input shaft portion between the driven pulley 8 and the radial bearing 22.

Further, the end portion D of the input shaft 23 protruding into the housing 21 is formed with a recessed portion 21b. The concave portion 21b and the adjacent end of the drive shaft 5o are fitted through a radial bearing 26, so that the human power shaft 23 and the drive shaft 50 are coaxially arranged. A frictionless variable speed mechanism section is provided between these manpower and output shafts.

That is, 27 is an input disk integrally provided on the outer periphery of the protruding end of the input shaft 23, and 28 is the input disk 2.
7 is an output disk rotatably inserted into the protruding end of the drive shaft 50.

A plurality of planetary cones 29 (only two are shown) are provided between the outer peripheral ends of the input disc 27 and the output disc 28.
is mediated.

Here, to explain the planetary cone 29, the planetary cone 29 has a substantially umbrella shape having three transmission surfaces. That is, the planetary cone 29 has a small-diameter disk portion 30 coaxially provided integrally with the conical bottom surface of the conical portion 29a, and a mounting shaft 31 coaxially provided integrally with the bottom surface of the disk portion 30. It becomes. And the disk part 30
The side surface of the input disk 27 is formed into a concave shape so as to frictionally engage with the outer peripheral end of the input disk 27, and serves as a transmission surface 32 of N1. Further, the bottom peripheral edge of the conical portion 29a is formed into a flat surface or a surface close to the flat surface, and the output disk 29a
8 and constitutes a second transmission surface 33 that frictionally engages with the outer circumferential end of the second transmission surface 33 . Further, the conical portion 29g is configured to have an obtuse apex angle, and the side surface of the conical portion 29a is formed by a speed change ring 3, which will be described later.
The third transmission surface 34 frictionally engages with the third transmission surface 6.

Then, these planetary cones 29 are attached to the shaft 4 with a retainer 35.
It is rotatably attached around I[A.

In other words, the retainer 35 has a disc shape, which is a plate member formed into a truncated cone shape. This retainer 35 is
With the side wall disposed on the input shaft 23 side, the center portion of the side wall is rotatably fitted into the end portion of the input shaft 23 protruding from the input disk 27. The rest 35 is rotatably mounted coaxially with the axis A, and each planetary cone is arranged so that the generatrix of the conical portion 29a on the drive shaft 50 side is substantially parallel to the axis.

The parts are frictionally engaged. Further, the circle of the planetary cone family ≦ the circumference of the cone base, that is, the output disk 2
The outer peripheral end portions of 8 are frictionally engaged.

A stepped portion 39 along the axis entry direction is formed in the housing surface portion (including the oil reservoir portion 37) around these planetary cones 29, and the speed change ring 36 is placed within this stepped portion 39 along the axis A direction. It is slidably inserted. Further, on the inner peripheral surface of the speed change ring 36, a convex portion 36a is formed in the circumferential direction in contact with a slope parallel to the axis A of the conical portion 29a. By varying the position of the contact point 29 between the apex angle and the peripheral edge, the rotational speed from the input shaft 23 can be changed (by changing the revolution speed of the planetary cone 29). In this embodiment, for example, from "speed ratio 0 (position near the periphery of the conical portion 29a) to speed ratio 1 (position near the periphery of the conical portion 29a)"
The rotation speed is changed steplessly within the range of 9H (near the apex angle).

Further, due to the arrangement of the planetary cone 29 and the retainer 35, the lower part of the lower planetary cone 29 and the gear shift ring 36 is transferred to the refrigerating machine oil 38 in the oil sump 37.
As the refrigerating machine oil 38 splashes up due to the revolution and rotation of the planetary cone 29, the refrigerant passes from the suction nozzle 62 through the inside of the nozzle 21 and is sucked in from the notch 60 of the compressor section 40. The refrigerating machine oil 38 is mixed with other components or supplied to the sliding parts of the transmission section 20.

On the other hand, the upper part of the speed change ring 36 has the same speed change ring 36.
A drive mechanism 70 is provided to drive the. Drive mechanism 7
No. 0 uses a structure in which a drive pin 71 that protrudes upward is provided on the upper part of the speed change ring 36, and this drive pin 71 is driven in the axis entry direction using a cam mechanism.

That is, to explain the drive mechanism 70, 72 is a cam block disposed within the abutment body portion 21a. As shown in FIG. 4, the cam block 72 is a band-shaped block extending along the left-right direction of the transmission 20 (the direction perpendicular to the axis A, which is the depth and the front in the figure). The lower center of the cam block 72 is connected to the protrusion of the drive pin 71. Although not shown, this cam block 72 has two parts along the axis A direction.
The book guide bin restricts the book to slide only along the axis A direction, and at the same time, the book is always pushed in the rear direction indicated by the arrow Y by the elastic force of a coil spring (not shown). Thereby, when the cam block 72 slides, the speed change ring 36 slides in the direction of the axis A. A cam surface 73 formed of a flat or curved surface is provided on the rear side surface of the cam block 72 and is inclined to widen as the depth increases.

Further, on the rear side of the eye body portion 21a, a screw shaft 74 is arranged parallel to the cam surface 73. Screw shaft 7
4 is composed of, for example, a trapezoidal threaded shaft having a trapezoidal thread on the outer periphery, and has eye body portions 21.4 on both ends. It is rotatably supported by radial bearings 75 and 75 provided on the wall portion that constitutes a. Further, one end portion of the screw shaft 74 is connected to a drive motor 77 provided outside the housing 6 via a speed reducer 76 provided adjacent to the eye body portion 21a. In other words, the screw shaft 74 rotates as the drive motor 77 rotates. Further, a drive nut 78 is screwed into the threaded portion of the screw shaft 74 so as to be able to move forward and backward. The drive nut 78 has a drive surface 79 which is an inclined surface corresponding to the cam surface 73 of the cam block 72 and always comes into contact with the cam surface 73 of the cam block 72 under the elastic force of the biasing coil spring.
is being formed. In other words, the cam block 72 is
When the screw shaft 74 rotates forward or backward, it is displaced in the direction of the axis A by the drive nugget 78, which is displaced in the direction of arrow X while maintaining contact. That is, the drive motor 7
7, the speed change ring 36 is displaced in the direction of the axis A, so that necessary speed changes can be performed.

On the other hand, the output disk 28 is provided with a pressure regulating cam mechanism 80 (pressing force generating means). Here, to explain the pressure regulating cam mechanism 80, reference numeral 8 is a hub fitted into the drive shaft portion exposed from the notch 60. The hub 81 is
It is composed of a small-diameter cylindrical portion 81a that is fitted onto the drive shaft 50 via a power transmission key 81c, and a large-diameter cylindrical portion 81b that is concentric with the small-diameter cylindrical portion 81a, connected to the output disk 28 side, and protrudes outward. Note that the small diameter cylindrical portion 81a can be displaced in the axial direction. Also, the large diameter cylindrical portion 81b of the knob 81 and the output disk 2 are in opposing relationship.
A cam disk 82 formed in a disk shape is slidably inserted into the drive shaft portion between the drive shaft 8 and the drive shaft 8 . In other words, the cam disk 82 is rotatable and axially displaceable. The cam disk 82 and the /X block 81 are arranged between the plate surface portion of the cam disk 82 and the plate surface portion of the large diameter cylindrical portion 81b, which face each other.
, and four parts 84 and 84 that restrict the movement of the steel balls 83 provided on each plate surface portion.

Also, the output disk 28 and the cam disk 8 facing each other
2 means the output disk 2 of the cam disk 82 by press fitting.
A plurality of bins 85 protruding from the plate surface portion on the 8 side are loosely fitted into an insertion hole 86 drilled in the output disk 28, thereby being connected so as to be freely displaceable in the direction of the axis. The rotational force is transmitted by the pin 85 and the insertion hole 86, and the steel ball 83
By transmitting the rotational force through the recesses 84 and 84, the variable speed rotation output from the output disk 28 is output to the drive shaft 50, which serves as an output shaft. Further, a plurality of compression coil springs 87 are interposed between the output disk 28 and the cam disk 82. With the elastic force of this compression coil spring 87, the output disk 28
The planetary cone 29 is always energized. That is, the structure is such that the biasing force of the compression coil spring 87 applies pressurization to each part that is frictionally engaged with the transmission 20 at the initial stage of rotation, thereby imparting the frictional engagement force necessary for the transmission function. There is. Note that the small diameter cylindrical portion 81a of the hub 81
A thrust bearing 88 is interposed between the end face of the hub 81 and the valve plate portion facing the end face of the hub 81, and is configured to rotatably receive the reaction force transmitted to the hub 81.

A control system of the compressor 1 with a variable transmission configured as described above is shown in FIGS. 1 and 2.

That is, 90 is a control section. This control section 90 includes
A/C switch, temperature setting knob (-1℃ to 1℃ inside the membrane)
Switches such as those that can be adjusted within a range of 5℃ (
An operating section 91 (not shown) is connected to the controller 91, so that information necessary for the cooling operation, such as starting and stopping (on/off) the cooling operation, and setting temperature, etc., can be input.

The control unit 90 also includes a Ta temperature sensor 92 (hereinafter simply referred to as Ta sensor) that detects the temperature Ta of the air blown out from the evaporator 5, and a Ta temperature sensor 92 (hereinafter simply referred to as Ta sensor), which is provided in the compressor unit 40 and detects the temperature Ta of the air blown out from the evaporator 5. Neo rotation speed detection sensor 93 (hereinafter simply referred to as Neo sensor) that detects the rotation speed, engine 9
A Ne rotational speed detection sensor 94 (hereinafter simply referred to as a Ne sensor) which is provided in the engine 9 and detects the rotational speed of the engine 9 is connected to each of them. Further, as shown in FIG. 1, the control section 90 includes a target compressor rotation speed setting circuit 95, a gear ratio calculation circuit 96, and a transmission drive circuit 97 connected to the drive motor 77 of the transmission 20. The circuits 95 to 97 are sequentially connected to the Ta sensor 92.

Further, the target compressor rotation speed setting circuit 95 is connected to the operation section 90, and in the target compressor rotation speed setting circuit 95, the air temperature Ta input from the Ta sensor 92 and the target temperature Tao input from the operation section 90 are connected.
The target compressor rotation speed is calculated according to the deviation from the

Furthermore, the above-mentioned Ne sensor 94 is connected to the gear ratio calculation circuit 96, and in this gear ratio calculation circuit 96, the target compressor rotation speed inputted to the gear ratio calculation circuit 96 and the engine input from the Ne sensor 94 are connected. The required gear ratio δ is calculated from the rotational speed. At the same time, the gear ratio calculation circuit 96 is connected to the Neo sensor 93, and calculates the engine speed and NCO from the Ne sensor 94.
The current gear ratio is calculated from the compressor rotation speed input from the sensor 93. Then, the speed ratio calculation circuit 96 outputs a control signal corresponding to the deviation to change the current speed ratio to the target speed ratio δ to the transmission section drive circuit 97, and changes the energization control of the drive motor 77 to the target speed ratio. The gear ratio δ is set to . As a result, using the air temperature Ta blown out from the evaporator 5 as a parameter,
The gear ratio δ of the transmission 20 is controlled according to the cooling (air conditioning) load. Further, when the target compressor rotation speed setting circuit 95 receives an off signal to stop the operation from the operation unit 91, for example, the target compressor rotation speed is set to "0".
The gear ratio δ is set to "0", that is, the operation of the compressor section 40 is stopped in accordance with the off operation.

Further, the control section 90 includes a target compressor rotation speed setting circuit 95 and a compressor rotation speed correction circuit 99 connected to the operation section 91. Further, a timer circuit 100 is connected to the compressor rotation speed correction circuit 99. When the compressor rotation speed correction circuit 99 receives an off signal to stop the cooling operation from the operation unit 91,
The target compressor rotation speed is set to “0” according to the off signal.
It has a function to forcibly change the rotation speed suitable for recovery of the refrigerating machine oil 38 (speed of rotation that is easy to recover), for example, 800 rpi+, in priority to the speed ratio control to stop the operation. are doing. Further, the compressor rotational speed correction circuit 99 controls the speed ratio control (speed ratio 0) to set the target compressor rotational speed to "0" after the changed rotational speed is maintained for a predetermined time based on the timing of the timer circuit 100, for example. It has a return operation function, and refrigerating machine oil 38 is collected in the oil reservoir 37 before the operation is stopped, regardless of the rotation speed of the compressor section 40 during the off operation.

Next, the operation of such an automotive air conditioner will be explained.

When the engine 9 of the automobile is started, the rotation of the engine 9 is transmitted to the input shaft 23 of the compressor 1 with a transmission via the drive pulley 10, belt 11, and driven pulley 8. As a result, the input rotation is transmitted from the input disk 27 to the planetary cone 29, causing the planetary cone 29 to rotate and revolve around the axis A. Using the revolution of the planetary cone 29, the refrigerating machine oil 38 accumulated in the oil reservoir 37 is splashed up to lubricate the sliding parts of the transmission 20, and at the same time, the sliding parts of the compressor part 40 are lubricated. The refrigerating machine oil 38 is mixed into the refrigerant in the housing 21 so that the refrigerating machine oil 38 can be mixed with the refrigerant inside the housing 21.

Therefore, if a signal to start cooling operation is not inputted to the control unit 90 from the operation unit 91, the contact position of the speed change ring 36 with the third transmission surface 34 of the planetary cone 29 remains at the speed ratio 0 position, The rotation of the engine 9 is not transmitted to the compressor section 40.

Here, when the operating section 91 is operated and an ON signal for starting cooling operation is input to the control section 90, the speed change ring 36 is displaced by a speed ratio δ determined according to the cooling load. As a result, the output rotation obtained by the gear ratio δ is the output rotation of the output disk 28, the cam disk 82, the hub 81. It is transmitted to the wave plate 51 via the drive shaft 51, causing each piston 43 to reciprocate. Then, the refrigerant flows from the suction nozzle 62 into the housing 21, into the notch 60, and into the suction chamber 55.
It is sucked into the cylinder 42 through the cylinder 42 and is compressed. Then, the compressed refrigerant passes through the discharge chambers 59 and 61 and the nozzle mounting body 63, and is discharged from the discharge nozzle 64 to the refrigeration cycle circuit 7. During the distribution of these refrigerants,
The components of the refrigerating machine oil 38 contained in the refrigerant are the components of the transmission device 20.
The lubricant is supplied to each sliding part of the compressor part 40 and to each sliding part of the compressor part 40 to lubricate each part.

Then, the discharged refrigerant is transferred to the condenser 2 and the receiver tank 3.
, the expansion valve 4, and the evaporator 5, forming a cooling cycle. Then, the cold air obtained by heat exchange in the evaporator 5 is blown into the cabin of the automobile by the blower fan 5a, thereby cooling the inside of the vehicle.

This cooling operation is continued under continuously variable control according to the cooling load using the air temperature Ta as a parameter. Specifically, the transmission 20 is controlled according to the flowchart shown in FIG.

That is, the initial conditions of the items shown in S (step) 1 are set in advance in the control unit 90.

However, r T ao: target blowing air temperature, r N
coset: Minimum set compressor rotation speed suitable for oil recovery, rMset: Set time required for oil recovery.

Then, by operating the operation unit 91, A/
When the C switch is turned on, the gear ratio δ is adjusted as in Sequence 83 and S4.

That is, in accordance with the ON operation of the A/C switch, the control unit 90 changes the Ta temperature sensor 92 to the outlet temperature of the evaporator 5, Ta5Ne, the rotation speed Ne of the engine 9 from the rotation speed detection sensor 94, and the rotation speed Ne of the engine 9 from the Neo rotation speed detection sensor 93 to the compressor. Part 40
The rotation speed Neo is detected. First, the target compressor rotation speed setting circuit 95 compares the blowout temperature Ta with the set temperature input from the operation unit 91, that is, the target blowout air temperature Tao, and calculates the target compressor rotation speed according to the deviation. . Next, the gear ratio calculation circuit 96 calculates the gear ratio δ necessary for the cooling operation from the target compressor rotation speed and the engine rotation speed Ne. Both in the same circuit 96, the current gear ratio is calculated from the input compressor rotation speed Nco and engine rotation speed Ne. Then, a control signal corresponding to the difference in these speed ratios is output from the speed ratio calculation circuit 96 to the transmission drive circuit 97, and the transmission drive circuit 97 energizes the drive motor 77 to achieve the target speed ratio δ. To go.

Here, if the A/C switch of the operating section 90 is turned off during operation, the gear ratio δ becomes "0" and the cooling operation is stopped from power transmission to the compressor section 40.
Depending on the operating conditions before the cooling operation is stopped, the amount of oil stored in the oil reservoir 37 may be small or almost non-existent. Specifically, when operation is performed in a low gear ratio region, the discharged refrigerant decreases and the refrigerating machine oil 38 returns to the compressor 1 with a variable transmission.
In such cases, the accumulated amount becomes extremely small or completely disappears.

According to this invention, as the A/C switch is turned off, the compressor rotational speed correction circuit 99 operates prior to stopping the compressor section 40, thereby eliminating this problem.

That is, when the compressor rotation speed correction circuit 99 operates, the timer circuit 100 operates to measure the time, and S10 and S
11, during the set time M set, the gear ratio δ continues to be adjusted so that the compressor rotation speed Nco becomes the set compressor rotation speed NCO8et, regardless of the rotation speed when the A/C switch is turned off. Specifically, in Figure 6,
As shown by the solid line A, before turning off the A/C switch, the compressor rotation speed Nco is the set compressor rotation speed N C0
When the rotation speed is higher than 5et (heat load is large), the compressor rotation speed Nco is forcibly set to r800 rpmJ according to the A/C switch off operation.
On the other hand, as shown by broken line B, before the A/C switch is turned off, if the compressor rotation speed Nco or the set compressor rotation speed Ncoset is lower than the rotation speed (thermal load or small), then In order to turn off the A/C switch, the compressor rotation speed NCO is forcibly increased to r800 rpmJ.

Then, the refrigeration oil 38 returns from the refrigeration cycle circuit 7 to the compressor main body 1a together with the refrigerant. That is, refrigerant containing refrigerating machine oil 38 flows into the transmission 2o from the suction nozzle 62 and accumulates in the oil reservoir 37.

Then, when the set time Mset has elapsed, the control section 9
0 determines that the oil reservoir 37 has the amount of oil necessary for lubrication,
The drive motor 77 is controlled so that the speed ratio δ becomes rOJ, and the cooling operation is stopped.

Therefore, the necessary amount of oil can always be secured in the oil reservoir 37 immediately before the cooling operation is stopped.

Therefore, even when the cooling operation is stopped, the lubrication of the transmission 2o is not impaired, and the reliability of the compressor 1 with a transmission can be improved.

Further, the present invention is not limited to the first embodiment described above, but the second embodiment shown in FIGS. 7 to 9,
The third embodiment shown in FIGS. 10 to 12 may also be used.

In the second embodiment, the compressor rotation speed Nco is forcibly reduced to recover the refrigerating machine oil 38 before the operation is stopped, as in the first embodiment described above, only when the amount of refrigerant discharged is small and the compressor rotation speed is low. The rotation speed has been changed to make it easier to rotate.

To explain the difference from the first embodiment, in terms of the configuration, the compressor rotation speed correction circuit 99 sets the gear ratio δ only in the rotation speed range of the compressor rotation speed Nco with a low amount of return oil. The difference is that a function to change the N coset is provided. In addition, in the flowchart, "compressor rotation speed Neo" is set between S2 and SIO.
The difference is that S20 is set to indicate that if the rotation is in a low return oil amount rotation range where the oil amount is insufficient, S20 is set to proceed to 510.

In this way, it is possible to indirectly detect that there is insufficient oil in the oil reservoir 37 and return the refrigerating machine oil 38 only at that time.
can be collected.

In addition, Fig. 9 shows the low compressor rotation speed Nc before the operation is stopped.
This shows the change when o is forcibly increased to the set compressor rotation speed N coset in order to turn off the A/C switch. Of course, although not shown in the figure, when the compressor rotation speed Nco is high, the gear ratio immediately becomes 0 (operation stopped) in accordance with the off operation of the A/C switch.

In the third embodiment, only when the refrigerating machine oil 38 is not collected in the oil sump 37, the compressor rotation speed Nco is forcibly changed to the refrigerating machine oil 38 before the operation is stopped, as in the first embodiment.
The rotation speed has been changed to make recovery easier.

To explain the difference from the first embodiment, as shown in FIGS. 11 and 12, the inner bottom of the housing 21 constituting the oil reservoir 37 is provided with the minimum amount required for lubrication. A liquid level sensor 98 is provided which detects whether there is an oil amount or not by turning on and off, and the detection signal of this liquid level sensor 98 is connected to nine compressor rotation speed correction circuits, and further to the compressor rotation speed correction circuit 99. The difference is that when the liquid level sensor 98 is off (no oil), a function is provided to change the gear ratio δ to the set compressor rotation speed N coset until the liquid level sensor 98 outputs an on signal. The liquid level sensor 98 may be a sensor that uses capacitance that changes depending on whether the refrigerant or refrigeration oil (lubricating oil) is used between the electrodes, or a sensor that uses a heater and a thermistor as electrodes to connect the refrigerant and refrigeration oil (lubricating oil). ) using a sensor that makes judgments based on the difference in thermal conductivity.

In addition, in the flowchart, as shown in FIG. 10, instead of S10 shown in the flowchart of the first embodiment, "
The difference is that S30 is set to indicate that if the signal output from the liquid level sensor is off, the process proceeds to Sll, and if it is on, the process proceeds to S12.

In this way, it is possible to directly detect the oil shortage in the oil reservoir 37 and return the refrigerating machine oil 38 only at that time.
can be collected.

In the first to third embodiments described above, r90 secJ is used as the set time Mset, and r800 rpi J is used as the set compressor rotation speed N coset.
However, these set values vary depending on the size of the refrigeration cycle circuit and the compressor model, so they are not limited to the set values. However, according to experiments, N
An effective oil recovery effect could be obtained when coset was r500 to 1000 r I)IIIJ and Mset was r60 to 120 secJ.

Further, in the first to third embodiments described above, the rotation speed change control of the compressor section 40 for recovering the refrigerating machine oil 38 is performed by setting the set compressor rotation speed N coset, but the invention is not limited to this. For example, "0.1~0
．． It is also possible to set one value in the range of 3'' as the set gear ratio and control the rotation speed change so that the set gear ratio remains constant.

Furthermore, in the first to third embodiments described above, a piston type compressor section and a frictionless continuously variable transmission device were used.
The present invention is not limited to this, and other types of compressor units (rotary, scroll, etc.) and transmissions (planetary gear mechanism, etc.) may be used.

[Effects of the Invention] As described above, according to the invention set forth in claim 1, lubricating oil necessary for lubrication can always be ensured in the oil reservoir before the operation is stopped.

Therefore, it is possible to improve the lubricity of the transmission section when the operation is stopped.

Further, according to the inventions set forth in claims 2 and 3, in addition to the above, lubricating oil can be recovered effectively without waste.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the invention,
FIG. 1 is a block diagram showing the configuration of a control unit that changes the gear ratio, FIG. 2 is a schematic configuration diagram showing an automotive air conditioner to which the present invention is applied, and FIG. 3 is a side sectional view showing a compressor with a transmission. ,
Figure 4 is a plan sectional view taken along line IV-IV in Figure 3;
The figure is a flowchart to explain the control for forcibly changing the compressor rotation speed before the A/C switch is turned off and the operation is stopped. Figure 6 shows the change in the compressor rotation speed when the A/C switch is turned off. 7 is a block diagram showing the configuration of the control section of the second embodiment of the present invention, and FIG. 8 is a diagram showing the configuration of the control section according to the second embodiment of the present invention, and FIG. Flowchart for explaining the control for forcibly changing the compressor rotation speed, No. 9
The figure is a diagram showing the change in compressor rotation speed when the A/C switch is turned off, and Figure 10 is a graph showing the change in compressor rotation speed when the A/C switch is turned off in the third embodiment. FIG. 11 is a block diagram showing the configuration of the control section, and FIG. 12 is a side sectional view showing the oil level sensor in its installed state. 1a... Compressor main body, 1... Compressor with variable speed gear, 2
0... Transmission device (transmission part), 37... Oil sump part,
38... Refrigerating machine oil (lubricating oil), 40... Compressor section,
90...Control unit, 91...Operation unit, 92...Ta
Temperature sensor, 93...800 Rotation speed detection sensor, 94
... Ne rotation speed detection sensor, 95 ... Target compressor setting circuit, 96 ... Gear ratio calculation circuit, 97 ...
Transmission drive circuit, 98...Liquid level sensor, 99...
Target compressor rotation speed correction circuit, 100... timer circuit. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (3)

[Claims] 1. The input shaft part is connected to a compressor part via a transmission part, and has an oil reservoir part for storing a common lubricating oil for lubricating the transmission part and the compressor part, and the lubricating oil is refrigerant gas. a compressor body mixed with water and discharged to the outside; an air conditioning control means for controlling the gear ratio of the transmission section according to the air conditioning load; an on/off means for turning on and off the air conditioning control means; means for stopping the operation of the compressor section in response to an off operation; and a means for temporarily rotating the compressor section suitable for recovering lubricating oil before the operation of the compressor section is stopped when the on/off means is turned off. A compressor with a transmission for automobile air conditioning, characterized in that it is equipped with an oil recovery control means for controlling the number of oil recovery. 2. The input shaft part is connected to a compressor part via a transmission part, and has an oil reservoir part for storing a common lubricating oil for lubricating the transmission part and the compressor part, and the lubricating oil is refrigerant gas. a compressor main body that is mixed with water and discharged to the outside, a compressor rotation speed detection means that detects the rotation speed of the compressor section, and an air conditioning control means that controls the gear ratio of the transmission section according to the air conditioning load. an on-off means for turning on and off the air conditioning control means; a means for stopping the operation of the compressor section in response to an off operation of the on-off means; and a means for detecting the rotational speed of the compressor when the on-off means is turned off. an oil recovery control means for temporarily controlling the compressor section to a rotation speed suitable for recovering lubricating oil before stopping the operation of the compressor section when a rotation speed range with a low amount of return oil is detected from the compressor section; A compressor with a transmission for automotive air conditioning, characterized by comprising: 3. The input shaft part is connected to a compressor part via a transmission part, and has an oil reservoir part for storing a common lubricating oil for lubricating the transmission part and the compressor part, and the lubricating oil is refrigerant gas. a compressor body mixed with water and discharged to the outside; an air conditioning control means for controlling the gear ratio of the transmission section according to the air conditioning load; an on/off means for turning on and off the air conditioning control means; a means for stopping the operation of the compressor section in response to an off operation; an oil detection means for detecting whether lubricating oil is present in an oil reservoir of the compressor body; an oil recovery control means for temporarily controlling the rotation speed of the compressor section to a rotation speed suitable for recovering lubricating oil before stopping the operation of the compressor section when an oil-free detection signal is detected from the oil detection means; A compressor with a transmission for automotive air conditioning, which is characterized by the following: